The Z150s could be the moment of the first shot, since the Governor's and Nellie Connallys' rightward head turns occur beginning at Z162 and Z167 respectively. Jackie (who had been "posing" for the Croft photo) begins her rightward head turn in the Z170s.

The men in Camera Car 3 (CC3) are shown in Hughes H650 turned around and laughing (at a curbside reporter who dropped a camera roll toss from their car). Robert Jackson said they were doing that when they heard the first shot. Officer Baker said he was about halfway along the block when he heard the first shot. His line of sight in H650 would show significantly more of the north half of the block than the south half.

Hughes H679 (1.6 sec later than H650) is (per Myers) about equivalent to Z184. Baker's line of sight would seem to exclude the County Criminal Courts Building and be largely composed of the County Records Building.

The Hughes doorway film syncs with the Martin doorway filmwe can see this by looking at Gerda's GIF

In Trasks " Pictures of the pain " we can see that Martins doorway footage was taken at 12:50PMand since Hughes has the same Timeline, we know that the Hughes footage was also taken at 12:50PM

The "Dallas Cinema Associates" film contained the Martin footage which was shot at 12:50PM

Hughes Gif part 1

Hughes GIF part 2

- JFK ASSASSINATION URBAN LEGENDS CONTINUE TO MULTIPLY -

To be accurate, Trask says "At ABOUT 12:50". What does that Mean Exactly ?? On top of that, Trask is Quoting Absolutely Nobody with His "At About 12:50" estimation being thrown out there. Yet, in the face of All of this, You attach a 12:50 FIRM TIMELINE to the Martin footage, and You then Compound Your Error, and attach that same 12:50 FIRM TIMELINE to the Hughes footage. BONG. You just Created 2 JFK Assassination Urban Legends, and who knows how many More Urban Legends will sprout from the Seeds that You just planted? Let's Remember that Trask also was Parroting the Clap Trap that The Wiegman Film was shot "Continuously" in his "Pictures Of The Pain". "Pictures Of The Pain" is a very good JFK Assassination book. It is Not GOSPEL, nor is He. Those interested in the JFK Assassination can Not simply Accept the "word" of someone as to what is a Fact with regard to this case. Whether it be Trask, Groden, Mack, Unger, etc., we all need to DO OUR OWN HOMEWORK.

I tend to agree with Royell, that Robin should have kept it as "somewhere near 12:50PM" rather than right on the money but somewhere near 12:50PM itself isn't actually disputed and it kind of gels with Hughes' previous capture of Harkness and Euins riding to the TSBD somewhere around 12:36pm.We have the radio broadcast from Harkness at 12:36pm, Hughes films him heading for the TSBD around that time and it's not that much of a stretch to imagine Hughes seeing him park up outside a building with a witness and walk down there himself just out of curiosity, or perhaps a little later when a crowd starts to gather at the steps that was not there when he filmed the Euins trip.